VMS Help LINK, Qualifiers, /DEBUG  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /DEBUG[=file-spec]
       /NODEBUG (default)

    Directs the linker to generate a debugger symbol table (DST)
    using DBG and TBT object language records and to give the
    debugger control when the image is run.

    If you specify the /DEBUG qualifier without entering a file
    specification, the OpenVMS Debugger gains control at run time.
    Requesting the OpenVMS Debugger does not affect the location of
    code within the image because the debugger is mapped into the
    process address space at run time, not at link time. See the
    OpenVMS Debugger Manual for additional information.

    If you specify the /DEBUG qualifier with a file specification,
    the user-written debugger module that the file specification
    identifies gains control at run time. The linker assumes a
    default file type of .OBJ. Requesting a user-written debugger
    module does affect the location of code within the image because
    the linker together with program code processes the debugger
    module code.